fix

0-0-intro/src/main/java/com/bobocode/intro/ExerciseIntroduction.java

@@ -1,6 +1,7 @@
 package com.bobocode.intro;
 
 import com.bobocode.util.ExerciseNotCompletedException;
+import java.util.Base64;
 
 /**
  * Welcome! This is an introduction exercise that will show you a simple example of Bobocode exercises.
@@ -23,7 +24,7 @@ public class ExerciseIntroduction {
      * @return "The key to efficient learning is practice!"
      */
     public String getWelcomeMessage() {
-        return "The key to efficient learning is practice!"; 
+        return "The key to efficient learning is practice!";
     }
 
     /**

0-0-intro/src/test/java/com/bobocode/intro/ExerciseIntroductionTest.java

@@ -8,7 +8,7 @@
 import static org.assertj.core.api.Assertions.assertThat;
 
 /**
- * This is a {@link ExerciseIntroductionTest} that is meant to verify if you properly implement {@link ExerciseIntroduction}. 
+ * This is a {@link ExerciseIntroductionTest} that is meant to verify if you properly implement {@link ExerciseIntroduction}.
  * It is a simple example that shows how each exercise is organized: todo section + tests.
  * <p>
  * A typical Java test uses JUnit framework to run the test, and may also use some other frameworks for assertions.
@@ -22,30 +22,30 @@
  */
 @TestMethodOrder(MethodOrderer.OrderAnnotation.class)
 class ExerciseIntroductionTest {
-    private ExerciseIntroduction exerciseIntroduction = new ExerciseIntroduction();
-    private String EXPECTED_MESSAGE = "The key to efficient learning is practice!";
-
-    @Test
-    @Order(1)
-    @DisplayName("getWelcomeMessage method returns correct phrase")
-    void getWelcomeMessage() {
-        String message = exerciseIntroduction.getWelcomeMessage();
-
-        assertThat(message).isEqualTo(EXPECTED_MESSAGE);
-    }
-
-    @Test
-    @Order(2)
-    @DisplayName("encodeMessage returns correct encoded message")
-    @SneakyThrows
-    void encodeMessageReturnsCorrectPhrase() {
-        var encodeMessageMethod = Arrays.stream(ExerciseIntroduction.class.getDeclaredMethods())
-                .filter(method -> method.getName().equals("encodeMessage"))
-                .findAny()
-                .orElseThrow();
-
-        var encodedMessage = encodeMessageMethod.invoke(new ExerciseIntroduction(), EXPECTED_MESSAGE);
-
-        assertThat(encodedMessage).isEqualTo("VGhlIGtleSB0byBlZmZpY2llbnQgbGVhcm5pbmcgaXMgcHJhY3RpY2Uh");
-    }
+	private ExerciseIntroduction exerciseIntroduction = new ExerciseIntroduction();
+	private String EXPECTED_MESSAGE = "The key to efficient learning is practice!";
+
+	@Test
+	@Order(1)
+	@DisplayName("getWelcomeMessage method returns correct phrase")
+	void getWelcomeMessage() {
+		String message = exerciseIntroduction.getWelcomeMessage();
+
+		assertThat(message).isEqualTo(EXPECTED_MESSAGE);
+	}
+
+	@Test
+	@Order(2)
+	@DisplayName("encodeMessage returns correct encoded message")
+	@SneakyThrows
+	void encodeMessageReturnsCorrectPhrase() {
+		var encodeMessageMethod = Arrays.stream(ExerciseIntroduction.class.getDeclaredMethods())
+				.filter(method -> method.getName().equals("encodeMessage"))
+				.findAny()
+				.orElseThrow();
+
+		var encodedMessage = encodeMessageMethod.invoke(new ExerciseIntroduction(), EXPECTED_MESSAGE);
+
+		assertThat(encodedMessage).isEqualTo("VGhlIGtleSB0byBlZmZpY2llbnQgbGVhcm5pbmcgaXMgcHJhY3RpY2Uh");
+	}
 }

1-0-java-basics/1-3-0-hello-generics/src/main/java/com/bobocode/basics/Box.java

@@ -7,7 +7,7 @@
  * <p>
  * todo: refactor this class so it uses generic type "T" and run {@link com.bobocode.basics.BoxTest} to verify it
  */
-public class Box {
+public class Box<T> {
     private T value;
 
     public Box(T value) {
@@ -21,3 +21,4 @@ public T getValue() {
     public void setValue(T value) {
         this.value = value;
     }
+}

1-0-java-basics/1-3-0-hello-generics/src/main/java/com/bobocode/basics/BoxDemoApp.java

@@ -1,5 +1,7 @@
 package com.bobocode.basics;
 
+import com.bobocode.basics.Box;
+
 /**
  * This demo demonstrates why using Object is not safe. It's not safe because runtime casting can cause runtime
  * exceptions. We should always fail as soon as possible. So in this code we should not allow setting String
@@ -9,12 +11,13 @@
  */
 public class BoxDemoApp {
     public static void main(String[] args) {
-        Box<Integer> intBox = new Box<>(123);
-        Box<Integer> intBox2 = new Box<>(321);
-        System.out.println((int) intBox.getValue() + intBox2.getValue());
+        Box intBox = new Box(123);
+        Box intBox2 = new Box(321);
+        System.out.println((int) intBox.getValue() + (int) intBox2.getValue());
 
         intBox.setValue(222);
-//        intBox.setValue("abc"); // this should not be allowed
-        System.out.println((int) intBox.getValue() + intBox2.getValue());
+        intBox.setValue("abc"); // this should not be allowed
+        // the following code will compile, but will throw runtime exception
+        System.out.println((int) intBox.getValue() + (int) intBox2.getValue());
     }
 }

1-0-java-basics/1-3-0-hello-generics/src/test/java/com/bobocode/basics/BoxTest.java

@@ -7,78 +7,78 @@
 
 @TestMethodOrder(MethodOrderer.OrderAnnotation.class)
 public class BoxTest {
-    private final String TYPE_PARAMETER_NAME = "T";
-
-    @Test
-    @Order(1)
-    @DisplayName("Box class has one type parameter")
-    void boxClassHasOneTypeParameter() {
-        var typeParameters = Box.class.getTypeParameters();
-
-        assertThat(typeParameters.length).isEqualTo(1);
-    }
-
-    @Test
-    @Order(2)
-    @DisplayName("Type parameter is called \"T\"")
-    void typeParameterIsCalledT() {
-        var typeParameter = Box.class.getTypeParameters()[0];
-
-        assertThat(typeParameter.getName()).isEqualTo(TYPE_PARAMETER_NAME);
-    }
-
-    @Test
-    @Order(3)
-    @DisplayName("Type parameter \"T\" is not bounded")
-    void typeParameterIsNotBounded() {
-        var typeParameter = Box.class.getTypeParameters()[0];
-
-        assertThat(typeParameter.getBounds()).hasSize(1);
-        assertThat(typeParameter.getBounds()[0].getTypeName()).isEqualTo(Object.class.getTypeName());
-    }
-
-    @Test
-    @SneakyThrows
-    @Order(4)
-    @DisplayName("Field \"value\" is \"T\"")
-    void valueFieldIsGeneric() {
-        var valueField = Box.class.getDeclaredField("value");
-        var genericType = valueField.getGenericType();
-
-        assertThat(genericType.getTypeName()).isEqualTo(TYPE_PARAMETER_NAME);
-    }
-
-    @Test
-    @SneakyThrows
-    @Order(5)
-    @DisplayName("Constructor parameter type is \"T\"")
-    void constructorParameterIsGeneric() {
-        var constructor = Box.class.getDeclaredConstructors()[0];
-        assert (constructor.getParameters().length == 1);
-        var parameter = constructor.getParameters()[0];
-
-        assertThat(parameter.getParameterizedType().getTypeName()).isEqualTo(TYPE_PARAMETER_NAME);
-    }
-
-    @Test
-    @SneakyThrows
-    @Order(6)
-    @DisplayName("Getter return type is \"T\"")
-    void getterReturnTypeIsGeneric() {
-        var getter = Box.class.getDeclaredMethod("getValue");
-
-        assertThat(getter.getGenericReturnType().getTypeName()).isEqualTo(TYPE_PARAMETER_NAME);
-    }
-
-    @Test
-    @SneakyThrows
-    @Order(7)
-    @DisplayName("Setter parameter type is \"T\"")
-    void setterParameterIsGeneric() {
-        var setter = Box.class.getDeclaredMethod("setValue", Object.class);
-        assert (setter.getParameters().length == 1);
-        var parameter = setter.getParameters()[0];
-
-        assertThat(parameter.getParameterizedType().getTypeName()).isEqualTo(TYPE_PARAMETER_NAME);
-    }
+	private final String TYPE_PARAMETER_NAME = "T";
+
+	@Test
+	@Order(1)
+	@DisplayName("Box class has one type parameter")
+	void boxClassHasOneTypeParameter() {
+		var typeParameters = Box.class.getTypeParameters();
+
+		assertThat(typeParameters.length).isEqualTo(1);
+	}
+
+	@Test
+	@Order(2)
+	@DisplayName("Type parameter is called \"T\"")
+	void typeParameterIsCalledT() {
+		var typeParameter = Box.class.getTypeParameters()[0];
+
+		assertThat(typeParameter.getName()).isEqualTo(TYPE_PARAMETER_NAME);
+	}
+
+	@Test
+	@Order(3)
+	@DisplayName("Type parameter \"T\" is not bounded")
+	void typeParameterIsNotBounded() {
+		var typeParameter = Box.class.getTypeParameters()[0];
+
+		assertThat(typeParameter.getBounds()).hasSize(1);
+		assertThat(typeParameter.getBounds()[0].getTypeName()).isEqualTo(Object.class.getTypeName());
+	}
+
+	@Test
+	@SneakyThrows
+	@Order(4)
+	@DisplayName("Field \"value\" is \"T\"")
+	void valueFieldIsGeneric() {
+		var valueField = Box.class.getDeclaredField("value");
+		var genericType = valueField.getGenericType();
+
+		assertThat(genericType.getTypeName()).isEqualTo(TYPE_PARAMETER_NAME);
+	}
+
+	@Test
+	@SneakyThrows
+	@Order(5)
+	@DisplayName("Constructor parameter type is \"T\"")
+	void constructorParameterIsGeneric() {
+		var constructor = Box.class.getDeclaredConstructors()[0];
+		assert (constructor.getParameters().length == 1);
+		var parameter = constructor.getParameters()[0];
+
+		assertThat(parameter.getParameterizedType().getTypeName()).isEqualTo(TYPE_PARAMETER_NAME);
+	}
+
+	@Test
+	@SneakyThrows
+	@Order(6)
+	@DisplayName("Getter return type is \"T\"")
+	void getterReturnTypeIsGeneric() {
+		var getter = Box.class.getDeclaredMethod("getValue");
+
+		assertThat(getter.getGenericReturnType().getTypeName()).isEqualTo(TYPE_PARAMETER_NAME);
+	}
+
+	@Test
+	@SneakyThrows
+	@Order(7)
+	@DisplayName("Setter parameter type is \"T\"")
+	void setterParameterIsGeneric() {
+		var setter = Box.class.getDeclaredMethod("setValue", Object.class);
+		assert (setter.getParameters().length == 1);
+		var parameter = setter.getParameters()[0];
+
+		assertThat(parameter.getParameterizedType().getTypeName()).isEqualTo(TYPE_PARAMETER_NAME);
+	}
 }